All-natural multi-functional ingredient system for preservative-free and self-preserving cosmetics. High purity monoesters of caprylic acid and undecylenic acid for its biostatic activity against bacteria and yeast. The latter is known for its activity against fungus. This combination provides remarkable broad-spectrum effects. Emollient, co-emulsifier, skin re-fatting agent and biostatic system. Recommended for use in w/o or o/w emulsion systems such as skin care creams and lotions.